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Hydrochloric Acid → (R)-2-[(R)-2-(6-Bromo-3-fluoro-pyridin-2-yl)-2-(4-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid ethyl ester

HRID 474105
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 474105
[CH2:1]([O:3][C:4](=[O:12])[C@:5]([OH:11])([CH3:10])[C:6]([F:9])([F:8])[F:7])[CH3:2].CC([O-])(C)C.[K+].[Br:19][C:20]1[N:25]=[C:24]([C:26]2([CH3:41])[CH2:28][N@@:27]2[S:29]([C:32]2[CH:37]=[CH:36][C:35]([N+:38]([O-:40])=[O:39])=[CH:34][CH:33]=2)(=[O:31])=[O:30])[C:23]([F:42])=[CH:22][CH:21]=1.Cl>CN(C=O)C.[Cl-].[Na+].O.CC(OC)(C)C>[CH2:1]([O:3][C:4](=[O:12])[C@:5]([O:11][CH2:41][C@@:26]([C:24]1[C:23]([F:42])=[CH:22][CH:21]=[C:20]([Br:19])[N:25]=1)([NH:27][S:29]([C:32]1[CH:37]=[CH:36][C:35]([N+:38]([O-:40])=[O:39])=[CH:34][CH:33]=1)(=[O:30])=[O:31])[CH3:28])([CH3:10])[C:6]([F:7])([F:8])[F:9])[CH3:2]
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Komponenten

8

Edukt 4

HCID 313Hydrochloric AcidHCID 23665647Potassium tert-butoxideHCID 26985621(R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propionic acid ethyl esterHCID 178421671HCID 178421671, Verbindung

Produkt 1

HCID 86668076(R)-2-[(R)-2-(6-Bromo-3-fluoro-pyridin-2-yl)-2-(4-nitro-benzenesulfonylamino)-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid ethyl ester
Ausbeute 65,8 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 6228DimethylformamideLösungsmittel2×HCID 15413tert-Butyl methyl etherLösungsmittelHCID 57417360Sodium chloride; waterLösungsmittel

Versuchsvorschrift

A solution of (R)-3,3,3-trifluoro-2-hydroxy-2-methyl-propionic acid ethyl ester (11.93 g, 64.1 mmol) in DMF (158 ml) was evacuated/flushed with nitrogen twice. A solution of KOtBu (6.21 g, 55.5 mmol) in DMF (17 ml) was added in a dropwise while maintaining a reaction temperature of ca 25° C. using cooling with a water bath. After 15 min solid 6-bromo-3-fluoro-2-[(S)-2-methyl-1-(4-nitro-benzenesulfonyl)-aziridin-2-yl]-pyridine (17.78 g, 42.7 mmol) was added and stirring was continued for 3 h. The reaction mixture was poured onto a mixture of 1M HCl (56 ml), brine and TBME. The layers were separated, washed with brine and TBME. The combined organic layers were dried over MgSO4.H2O, filtered and evaporated. The crude reaction product was purified via chromatography on silica gel (hexanes/25-33% TBME) to yield 16.93 g of the title compound as a yellow resin that was contaminated with an isomeric side-product (ratio 70:30 by 1H-NMR).

Aufarbeitung

  1. temperaturewhile maintaining a reaction temperature of ca 25° C.
  2. temperatureusing cooling with a water bath
  3. customThe layers were separated
  4. washwashed with brine and TBME
  5. dry with materialThe combined organic layers were dried over MgSO4.H2O
  6. filtrationfiltered
  7. customevaporated
  8. customThe crude reaction product
  9. customwas purified via chromatography on silica gel (hexanes/25-33% TBME)

Quellen und Nachweise

ORD-Eintrag
ord-cc02c681880547399a0ba0ca18075b1e
Quelldatensatz
uspto-grants-2014_01
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US08637508B2

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